Preliminary Data Analysis on the 2011-2012 Heat Load of the LHC Inner Triplets and Stand Alone Magnets

Electron clouds generated inside the LHC beam chamber deposit heat to the beam walls. These heat signatures provide valuable information to understand the behavior of electron clouds under certain circumstances. The heat loads from the Inner Triplets and the Stand Alone Magnets (SAMs) are used for this investigation. The data of the inner triplets confirmed with previous studies about the fact that two 50ns beams are required for a significant electron cloud. The data has also revealed that the difference between the heat load of the inner triplets decreases with time. Also, the heat load increase at injection divides itself from heat load of the two beams. Furthermore, the heat/proton ratio does not seem to change in 2011 and 2012 (they are equivalent under similar beam conditions), suggesting that the SEY value may not have changed. It is suggested to proceed with PyECLOUD for more conclusive results. The stand-alone magnets do not show measurable heat load from the electron cloud, except for the 25ns runs.